"This provides a little positive pressure to overcome any leaks in the house envelope. I wouldn't want to set these too far out of balance, because it would only waste energy; however, IMHO it is better to have a little positive pressure instead of a negative pressure, which would only suck in unconditioned air."
If the pressure isn't balanced, you want negative pressure in the winter and positive pressure in the summer. This is because the dew point inside the house is more likely to condense inside leaky areas going outside during the winter. In the summer the dew point on a hot day is usually above the temperature that is inside so a positive pressure is a good idea in this case.
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